[U-Boot] USBTTY and OMAP-L138 EVM (da850evm)

[Jeremy Torres]

Hello.  Please forgive the long post.  I was hoping to include as much
information as possible...

I have been trying to enable stdin/stdout to go over usbtty.  I have
read all the all-important README and have worked initially with the
Texas Instruments Linux Forum to enable usbtty support.

In summary, the 2009.11 version of u-boot did not contain musb_udc
support for the da850EVM.  Utilizing the current (2010.06) u-boot
source tree, I was able to get UDC enabled and usbtty to _partially_
work.

The Problem:
1. Upon setting stdin and stdout to "usbtty" on the EVM, I'm able to
see the u-boot "prompt" on the Linux host using minicom (i.e,
/dev/ttyUSB0).  However, I'm unable to see any input sent into the EVM
via minicom.

2. If only stdout is set to usbtty, I'm able to see all input (entered
via UART for stdin) on minicom.  So, apparently, usbtty for stdout
works in that I'm able to see all input made from the UART.

I've enabled MUSB_UDC debug; however, I do not see any debug output.
I shall try this effort again.

FYI, I also tried to configure the da850EVM on the most recent version
of u-boot (2010.06), but I was unsuccessful in configuring the
remainder of the peripherals for the board.

System Info:
EVM: Logic OMAP-L138 development kit (include/configs/da850evm.h)
u-boot version: 2009.11 (as provided from Texas Instruments)

Any help would be greatly appreciated.

Kindest Regards,
Jeremy